Add fix for short linestrings (#2432)

Co-authored-by: James Beard <james@smallsaucepan.com>

Author: rowanwins

packages/turf-clean-coords/index.ts

@@ -142,6 +142,10 @@ function cleanLine(line: Position[], type: string) {
     throw new Error("invalid polygon");
   }
 
+  if (type === "LineString" && newPointsLength < 3) {
+    return newPoints;
+  }
+
   if (
     isPointOnLineSegment(
       newPoints[newPointsLength - 3],

packages/turf-clean-coords/test/in/line-3-coords.geojson

@@ -0,0 +1,12 @@
+{
+  "type": "Feature",
+  "properties": {},
+  "geometry": {
+    "type": "LineString",
+    "coordinates": [
+      [0, 0],
+      [0, 0],
+      [0, 2]
+    ]
+  }
+}

packages/turf-clean-coords/test/out/line-3-coords.geojson

@@ -0,0 +1,11 @@
+{
+  "type": "Feature",
+  "properties": {},
+  "geometry": {
+    "type": "LineString",
+    "coordinates": [
+      [0, 0],
+      [0, 2]
+    ]
+  }
+}